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https://issues.apache.org/jira/browse/SPARK-3839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14164459#comment-14164459
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Apache Spark commented on SPARK-3839:
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User 'Ishiihara' has created a pull request for this issue:
https://github.com/apache/spark/pull/2723
> Reimplement HashOuterJoin to construct hash table of only one relation
> ----------------------------------------------------------------------
>
> Key: SPARK-3839
> URL: https://issues.apache.org/jira/browse/SPARK-3839
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.1.0
> Reporter: Liquan Pei
> Assignee: Liquan Pei
>
> Currently, in HashOuterJoin, we build hash tables for both relations,
> however, in left/right outer join, we only need to build hash table for one
> relation. For example, for left hash join, we build a hash table for the
> right relation and stream the left relation.
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